Quandaries
and Queries |
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Hi My question is how do you determine the length of a chord when given the diameter of the circle (1.6m) and that the angle = 7pi/8 Please help Many thanks Sue elementary (KS 3) I am the mum of a student who is struggling and would like to help them but before I can I need to know how it is worked out. |
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Hi Sue,
In the diagram the measure of the angle BCA is The triangle DCA is a right triangle and hence the sine of the angle DCA is
Using my calculator to find the value of the sine I got x = 0.7846 m and thus the length of the chord is 1.57 m. Penny |